#!/bin/bash

GDAL_TILE_PROCESSES=16
GDAL_TILE_ZOOMS=8-14
GDAL_SAMPLING_WARP=cubic
GDAL_SAMPLING_TILE=antialias

# Create virtual dataset with coordinates
gdal_translate -of VRT -a_srs EPSG:4326 -outsize 300% 300% -gcp 1518.0 1881.0 24.5 57.333333333333336 -gcp 19272.0 1788.0 25 57.333333333333336 -gcp 19407.0 24009.0 25 57 -gcp 1515.0 24033.0 24.5 57 O-35-98.jpg O-35-98.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1518.0 1881.0\n19272.0 1788.0\n19407.0 24009.0\n1515.0 24033.0" | \
  gdaltransform -tps -output_xy O-35-98.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  O-35-98.vrt O-35-98.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES O-35-98.cut.vrt O-35-98.xyz